1. A member of a Slavic people
2. Oak or birch
3. Afresh
4. Philosophy
5. Left or right
6. Across
7. Prefix indicating half
8. Resort
9. Make more humid
10. Cancel or reverse an action
11. Placed on a tee
13. Not state or provincial
14. More rational

20. A city in east-central France
21. A unit of mass
25. Break
26. Grizzlies or Polars, for example
27. Not essential
28. Long period of time
29. Utilisers
30. Shooting at clay pigeons
31. Extinct flightless bird
33. Biblical first woman
35. South-southeast
37. Latin for "The Same"
39. Acutely insightful